1. They keep busy.
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they keep busy
他们很忙
以上为机器翻译结果，长、整句建议使用 人工翻译 。
They keep busy.
他们保持忙碌。
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They keep themselves busy even after retirement.
他们甚至在退休后也让自己保持忙碌。
At a busy road in front of a gate of Bishan Middle School, the crosswalk is installed to keep the students safe when they cross the road after school.
在璧山中学门口一条繁忙的马路上，为了保证学生放学后过马路时的安全，设置了人行横道。
How do they keep busy?
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They are all busy trying to keep up with the swirling changes.
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